JP2502098Y2 - Thermo-hygrometer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermo-hygrometer for measuring dry-bulb temperature, wet-bulb temperature and humidity.

[0002]

2. Description of the Related Art For example, in building maintenance,
In order to improve the environment inside the building, the room temperature and humidity are recorded every day, and the temperature and humidity data are analyzed at a later date to adjust the air conditioning equipment and the like. On this occasion,
It is customary to refer to the wet-bulb temperature at the time of recording to confirm the temperature and humidity data.

Therefore, since a thermometer / humidity meter for building maintenance needs to be able to detect not only the dry-bulb temperature but also the wet-bulb temperature, conventionally, the dry-bulb temperature and the wet-bulb temperature are displayed and the difference between the temperatures is displayed. In order to avoid the hassle of using a dry-wet bulb thermometer that calculates humidity by taking the conversion table into consideration, or taking the conversion table into consideration, the temperature sensor for detecting the dry-bulb temperature and the sensor part were moistened with water soaked in gauze. Using an electronic thermo-hygrometer consisting of a wet-bulb temperature detection temperature sensor and an arithmetic unit that automatically calculates the humidity based on each of these data, the temperature and humidity are recorded, and at the same time the wet-bulb temperature is also recorded. I try to record it.

[0004]

However, in all of these, the temperature sensing part of the wet bulb thermometer and the sensor part of the temperature sensor for measuring the wet bulb temperature are wrapped in gauze, and the gauze is immersed in a water tank to keep it wet. Must be kept in a tight position. Therefore, it is troublesome that the amount of water in the aquarium must be monitored and the water must be replenished regularly. Particularly, in recent high-rise buildings, psychrometers are installed in many places on each floor, so management of such a thermo-hygrometer was very troublesome. If the pressure is constant, for example,
For example, dry bulb temperature, wet bulb temperature, dew point temperature, absolute humidity, relative humidity
Degree, steam partial pressure, specific volume, enthalpy, etc.
The quantity is the other state quantity if two kinds of values are decided.
It is known that can be read from the psychrometric chart
Absolute humidity based on the detected dry-bulb temperature and relative humidity
A temperature / humidity meter that calculates the state quantity of
62-146954, micro film). Only
In this case, all the information on the psychrometric chart is stored in the storage device.
Huge memory as it must be stored in memory
Not only the capacity is required and the cost is increased, but also the processing speed is increased.
It causes the problem of being late. For example, the dry-bulb temperature is -1
It is detected with an accuracy of 0.1 ℃ from 0 ℃ to +50 ℃.
When humidity is detected from 10 to 100% with an accuracy of 0.1%.
The wet bulb from the intersection of dry bulb temperature and relative humidity
When trying to read the temperature, the temperature detection point is 600 points, relative
Since there are 900 humidity detection points, the number of intersections is 600 ×
It reaches 900 = 540,000 points. And this 540,000 husband
Temperature data, relative humidity data, and wet bulb temperature data
I have to store three types of data
So, the number of data will be 1.62 million data by simple calculation
Therefore, a large storage device with a large storage capacity must be used.
I didn't. Therefore, in the present invention, not only the dry-bulb temperature and humidity but also the amount of water in the water tank is not monitored and the water is not replenished regularly, and a memory having a large storage capacity is used.
It has an object to make it easier to detect the door name rather wet bulb temperature.

[0005]

In order to solve this problem, the present invention provides a dry sensor that detects a temperature sensor and a humidity sensor.
In addition to the bulb temperature and humidity, the wet bulb calculated based on these
Thermo-hygrometer equipped with a display device for digitally displaying the temperature T _W
And a saturated vapor pressure at a dry-bulb temperature T detected by a temperature sensor and a storage device that stores saturated vapor pressure data corresponding to temperature in a temperature-saturated vapor pressure conversion table.
E and the virtual wet-bulb temperature T _{W (n)} set below the dry-bulb temperature T
Saturated water vapor pressure EW _(n) at
However , the virtual wet-bulb temperature T _{W (n)} should be decreased by a constant value.
Temperature T, _{TW (n)} and saturated steam at these temperatures
Virtual humidity H _(n) is sequentially calculated as a function of atmospheric pressure E, EW _(n)
Then, the calculated virtual humidity H _(n) was detected by the humidity sensor.
The virtual humidity H _(n) that has the smallest difference compared to the humidity H
The virtual used when selecting and calculating the virtual humidity H _(n)
Characterized by comprising an arithmetic unit <br/> for outputting wet bulb temperature T _{W (n) is} a wet bulb temperature T _W.

[0006]

According to the present invention, the temperature sensor and the humidity sensor detect the dry-bulb temperature and the humidity, and the humidity sensor is detected based on them.
The sphere temperature is calculated. At this time, the temperature sensor detects
Saturated water vapor pressure E at dry-bulb temperature T and dry-bulb temperature T or lower
Saturated water vapor at the virtual wet-bulb temperature T _{W (n)} set below
The pressure EW _(n) is converted into the temperature-saturated water vapor pressure conversion table of the storage device.
Read out from the table, and the virtual humidity H _(n) at each temperature T, _{TW (n)}
And the relationship between the saturated vapor pressures E and EW _(n) at these temperatures.
Calculate as a number. At this time, the storage device is
It is not necessary to store all the information,
Since only data showing the relationship of the water vapor pressure is enough, an example
For example, it can detect the range of -10 ℃ to + 50 ℃ with the accuracy of 0.1 ℃.
In case of doing, 600 points corresponding to the temperature data of 600 points
Saturated water vapor pressure data is sufficient, and the total number of data is at most
It becomes 1200, and when detecting with the same accuracy,
The storage capacity of storage is about 1/1000 compared with the conventional one.
become. Then, the value of the virtual wet-bulb temperature T _{W (n)} is gradually decreased.
Then, the virtual humidity H _(n) is sequentially calculated, and
Compare the virtual humidity H _(n) with the humidity H detected by the humidity sensor.
Te, both differences fewest virtual humidity H _(n) to select a constant, its
Virtual humidity T used to calculate the virtual humidity H _(n) of
The value of _{W (n)} is output as the wet bulb temperature T _W , which is digital.
Is displayed. Therefore, to detect the wet bulb temperature,
There is no need to use the gauze soaked in the water tank to moisten the sensor part or to monitor the water volume in the water tank and periodically supply water. In addition, since each value is displayed digitally, you can read the value displayed on the display device without any troublesome calculation or taking the conversion table into consideration.
Wet-bulb temperature and humidity can be easily measured.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a block diagram showing a thermo-hygrometer according to the present invention, FIG. 2 is a perspective view showing an appearance, and FIG. 3 is a flow chart showing a processing procedure of an arithmetic unit.

The thermo-hygrometer comprises a sensor probe 1 and a thermo-hygrometer main body 2 to which the sensor probe 1 is connected. The sensor probe 1 has a cylindrical case body 1a with an open tip.
And a protective cap 1b attached to the tip of the protective cap 1b. The case body 1a includes a temperature sensor 3 for detecting a dry bulb temperature and a humidity sensor 4 for detecting humidity.
It is provided so as to project from its tip so as to be housed inside, and has a built-in 1-chip microcomputer 5 for calculating the dry-bulb temperature, humidity and wet-bulb temperature based on the detection signals of the sensors 3 and 4. .

The temperature sensor 3 is composed of, for example, a thermistor whose resistance value changes in proportion to a temperature change, and the humidity sensor 4 uses an element using a moisture sensitive film whose resistance value changes in accordance with humidity. Each of the sensors 3 and 4 is connected as an oscillation resistance of the RC oscillator circuits 6 and 7, and the frequency-
It is connected to the microcomputer 5 through voltage conversion circuits 8 and 9 and A / D conversion circuits 10 and 11.

Furthermore, temperature and humidity meter main body 2, dry bulb temperature T in front of the case body 2a, together with a liquid crystal display device 12 for displaying the wet bulb temperature T _W and humidity H at the same time are arranged, the power supply side An on / off switch 13 is provided, a connector 16 for connecting a plug 15 of a connection cord 14 of the sensor probe 1 is provided on the upper surface, and inside each of the circuits 6, 7,
Batteries 17 for driving 8, 9, 10, and 11, the microcomputer 5, and the liquid crystal display device 12 are provided.

The microcomputer 5 includes an input interface 5a, an output interface 5b, and an R
The input interface circuit 5a includes a storage device 5c having an OM and a RAM, and a microprocessor (arithmetic device) 5d, and a switch signal from the switch 13 and a temperature detection value T from the A / D converters 10 and 11 to the input interface circuit 5a. _{The R} and the humidity detection value H _R are input, and the display data output from the output interface circuit 5b is the liquid crystal display device 12.
Is supplied to.

The storage device 5c includes a microprocessor 5
The processing procedure of d is stored in advance, and the resistance-temperature conversion table according to the characteristics of the temperature sensor 3 and the resistance-humidity conversion using the temperature according to the characteristics of the humidity sensor 4 as parameters are stored as data necessary for the processing. A table and a temperature-saturated water vapor pressure conversion table storing a saturated water vapor pressure corresponding to the temperature are set in the ROM.

The microprocessor 5d reads the temperature detection value T _R and the humidity detection value H _R, and according to the procedure stored in the storage device 5c, referring to predetermined data, the dry bulb temperature T, the humidity H and the wet bulb. Calculate the temperature T _W. In this case, the dry-bulb temperature T and the humidity H are detected based on the temperature detection value T _R and the humidity detection value H _R obtained by the temperature sensor 3 and the humidity sensor 4, and the wet-bulb temperature T _W is calculated by the following procedure. To be done.

That is, for example, the dry-bulb temperature is T, the corresponding saturated steam pressure is E, and the wet-bulb temperature T _W is equal to or lower than the dry-bulb temperature T. Therefore, the virtual wet-bulb temperature T _{W (n)} = T- Set to 0.1, the dry-bulb temperature T, saturated water vapor pressure E, virtual wet-bulb temperature T
_The virtual humidity H _(n) is calculated by substituting _{W (n)} and the corresponding saturated water vapor pressure E _{W (n)} into the following equation. H _(n) = [EW _(n) -0.5 (T-TW ( _n) )] / E * 100 (%) Then, the virtual wet-bulb temperature TW _(n) is gradually decreased to obtain the virtual humidity. H _(n) displays the value of the virtual wet bulb temperature T _{W (n)} which is closest to the detected humidity H at the humidity sensor 4 as wet bulb temperature T _W. Therefore, in order to detect the wet-bulb temperature, it is not necessary to use the gauze immersed in the water tank to wet the sensor unit, and to monitor the amount of water in the water tank and periodically supply water.

Next, the operation of the embodiment will be specifically described with reference to FIG. FIG. 3 is a flow chart showing the processing procedure of the microprocessor 5. When the switch 13 is turned on, the arithmetic processing is started to be executed. First, step (1)
Then, the temperature detection value T _R of the temperature sensor 3 input from the A / D conversion circuit 8 is read, the dry-bulb temperature T is calculated by referring to the resistance-temperature conversion table based on this, and this is calculated as RA.
The data is updated and stored in a predetermined storage area of M.

Then, the process proceeds to step (2), where the A / D
Humidity detection value H of the humidity sensor 4 input from the conversion circuit 9
_R is read, the humidity H is calculated based on the resistance-humidity conversion table corresponding to the temperature T, and this is updated and stored in a predetermined storage area of the RAM. Then, the process proceeds to step (3), the temperature T stored in step (1) is read from the RAM, the saturated vapor pressure E corresponding to the temperature T is read by referring to the temperature-saturated vapor pressure conversion table, and this is read. RAM
Is updated and stored in a predetermined storage area, and the process moves to step (4) to obtain the wet bulb temperature by the following procedure.

In step (4), first, the index n
After setting = 1, the process proceeds to step (5), the virtual wet-bulb temperature T _{W (n)} = T−0.1n is set, and the saturation corresponding to the virtual wet-bulb temperature T _{W (n)} is set in step (6). Read the water vapor pressure EW _(n) by referring to the temperature-saturated water vapor pressure conversion table, and
Move to (7). In step (7), T, E, T _{W (n)} , E
Calculate virtual humidity H _(n) by substituting _{W (n)} into the following formula: H _(n) = [EW _(n) -0.5 (TTW _(n) )] / E * 100 (%)

In step (8) and thereafter, the detected humidity H
The virtual humidity H _(n) closest to is calculated. First, the step
At (8), the calculated virtual humidity H _(n) is compared with the humidity H detected by the humidity sensor 4, and it is determined whether or not H _(n) ≦ H. Then, if H _(n) ≤ H is not satisfied, that is, if H _(n) > H, the process proceeds to step (9), the index n = n + 1 is set again, and the step is performed.
Return to (5). If H _(n) ≤ H, step
Shift to (10), the difference S between H _(n) and H _(n-1) and humidity H
_(n) = │H _(n) -H│ and S _(n-1) = │H _(n-1) -H│
Is calculated and the process proceeds to step (11).

In step (11), it is determined which of H _(n) and H _(n-1) is closer to the humidity H by comparing the magnitudes of S _(n) and S _(n-1) . And S _(n) ≤ S _(n-1)
Virtual humidity since H towards _(n) is close to the humidity H, the virtual wet bulb temperature T _{W (n) is} the wet bulb temperature T _W when seeking H _(n) and proceeds to step (12) when the As the virtual humidity H _(n-1) is closer to the humidity H when S _(n) > S _(n-1) , the process proceeds to step (13). H
virtual wet bulb temperature T _W at _which the _(n-1) was determined _(n-1) as a wet-bulb temperature T _W is stored in a predetermined storage area of the RAM.

Then, in step (14), the data of the dry-bulb temperature T, the wet-bulb temperature T _W and the humidity H is read out from the RAM and output to the liquid crystal display device 12, and in step (15) the switch 1
If 3 is in the on state, the process returns to step (1), and if it is in the off state, the process ends.

In the above description of the embodiment, the type in which the sensor probe 1 is connected to the temperature / humidity meter main body 2 has been described, but where the temperature sensor 3, the humidity sensor 4, the microcomputer 5 and the liquid crystal display device 12 are located. How to arrange the sensor probe 1 is arbitrary. For example, the sensor probe 1
Alternatively, the temperature sensor 3 and the humidity sensor 4 may be disposed inside the temperature / humidity meter main body 2. Further, although the liquid crystal display device 12 has been described as a type that simultaneously displays the dry bulb temperature, the wet bulb temperature and the humidity, a changeover switch may be provided to switch and display each value.

[0022]

As described above, according to the present invention, the temperature
The dry-bulb temperature and the virtual wet-bulb temperature detected by the
The calculated virtual humidity is the humidity detected by the humidity sensor.
The virtual wet-bulb temperature is
The data to be stored is
Is small, so a small storage device is sufficient.
Can be reduced. In addition, there is no need to use a gauze dipped in a water tank to moisten the sensor part, or to monitor the water volume in the water tank and supply water regularly. It has an effect that the humidity can be easily measured.

[Brief description of drawings]

FIG. 1 is a block diagram showing a thermohygrometer of the present invention.

FIG. 2 is a perspective view showing the external appearance of the thermo-hygrometer according to the present invention.

FIG. 3 is a flowchart showing a processing procedure.

[Explanation of symbols]

 1 ... Sensor probe 2 ... Temperature / humidity meter body 3 ... Temperature sensor 4 ... Humidity sensor 5 ... Microcomputer 5c ... Memory device 5d ... Microprocessor (arithmetic device) 12 ... Liquid crystal display

Claims (1)

(57) [Scope of utility model registration request] 1. A temperature sensor (3) and a humidity sensor (4)
A thermohygrometer equipped with a display device (12) for digitally displaying the wet-bulb temperature T _W calculated based on the dry-bulb temperature T and the humidity H detected in step S12. A storage device (5c) in which pressure data is stored in a temperature-saturated water vapor pressure conversion table, and a saturated water vapor pressure E at the dry bulb temperature T detected by the temperature sensor (3) and a hypothetical value set below the dry bulb temperature T wet bulb temperature T _W the storage device to a saturated water vapor pressure E _{W (n)} in _(n) read from (5c), wherein the virtual wet bulb temperature T _W each with a _(n) is reduced by a constant value the temperature T, T _{W (n)} and the virtual humidity H _(n) as a function of the saturated water vapor pressures E and E _{W (n)} at these temperatures are sequentially calculated, and the calculated virtual humidity H _(n) is detected by the humidity sensor (4). compared to the humidity H selects the difference is smallest virtual humidity H _(n), calculated the virtual humidity H _(n) Virtual wet bulb temperature T _{W (n)} of the wet-bulb temperature T _W, which was used at the time of
A thermo-hygrometer, which is equipped with an arithmetic unit (5d) for outputting as.